* #34699: large rewrite of account credentials access to display preferences

res/layout/activity_account_settings.xml

res/xml/account_credentials.xml

res/xml/account_security_prefs.xml

src/org/sflphone/account/AccountCredentials.java

src/org/sflphone/account/AccountDetailBasic.java

src/org/sflphone/account/AccountDetailsHandler.java

src/org/sflphone/client/AccountEditionActivity.java

src/org/sflphone/client/CallActivity.java

src/org/sflphone/fragments/NestedSettingsFragment.java

src/org/sflphone/fragments/SecurityAccountFragment.java

src/org/sflphone/loaders/AccountsLoader.java

src/org/sflphone/model/Account.java

src/org/sflphone/receivers/IncomingReceiver.java

src/org/sflphone/service/ISipService.aidl

src/org/sflphone/service/SipService.java